I think I am absolutely NOT surprised to find that this caught your eye. It would have caught mine, too! For sure. The green moss on the tree trunk alone would have, but the play of colour in the water as well. Was the blue really a purple or did you do something to the saturation? Peaceful scene. Lots of green! That makes a photo that I like.

But I also think that you ask for too little SPECIFIC critique to be letting this photo in Photo Critique. So I moved it to Landscape and Nature.

I hand printed this exactly as it appears here, the moss did at first draw me in but it was the light and colours that did the job, this is a scan from the original 6 x 6 bronnie neg. The colours were how it came from the enlarger, colour correct.